Portable scaffold



June 7,1927. 1,631,848

H. J. YAGER PORTABLE SCAFFOLD Filed Aug. 1. 1925 2 Sheets-Sheet l H. J: Ia er,

June 7,1927. I 1,631,848

H. J. YAGER OOOOOOOOOOOOOO LD Filed Aug. 1. 1925 F g 5 Patented June 7, 1927.

HARVEY J. YAGER, or SEATTLE, WASHINGTON.

PORTABLE SCAFFOLD.

Application filed August This invention relates to portable scaffolds, and it consists of the construction, combination and arrangement of parts hereinafter fully described and claimed, and illustrated in the accompanying drawings, wherein:

Figure 1 is a vertical sectional View illustrating the application of the portable scaffold;

Figure 2 is a sectional view taken on the horizontal plane indicated by the line 2-2 of Figure 1, and

Figure 3 is a detail view on an enlarged scale of one of the trusses of the scaffold.

Corresponding and like parts are referred to in the following description, and designated in the several views of the accompanying drawings by similar reference characters.

The scaffold is especially designed for use in lining concrete chimneys and elevator shafts of the type adapted to be built with the mold forming the subject matter of my (Bo-pending application, filed the 1st day of August, 1925, Serial No. 47,603. A chimney or elevator shaft of this type is shown in the drawings and designated 1, and is provided in its opposite inner side with recesses 2, the seats 3 of which are prevented from breaking down under the weight placed thereon by rods 4. The recesses 2 in each side of the structure 1 are arranged in horizontally alined pairs, and the pairs of recesses in one side are horizontally alined with those in the opposite side.

In accordance with the present invention, the recesses 2 are adapted to be utilized for the purpose of supporting a scaffold within the structure 1 in order that said structure may be provided with a suitable lining which for the purpose of illustration is shown as made of bricks. This brick lining is designated 5, and is shown as partly completed only.

The scaffold comprises horizontal trusses 6. Each of these parts comprises a top chord 7 having downwardly and outwardly beveled ends 8, posts 9 occupying certain of the recesses 2 and pivotally connected as at 10 to the underside of the chord 7, and a bottom chord 11 of sectional formation. The sections 11 and 11 of the bottom chord 11 are pivotally connected together as at 12 and to the posts 9, as at 13. The chord section- 11 is longer than the chord section 11", and is provided with a longitudinal series of 1, 1925:. Serial No. 47,002.

openings 14, through a selected one of which the pivot 12 passes. This chord section is als'ofprovided with ahook 15 which embraces the chord section 11 to limit the downward movement of the chord sections. The posts 9 rest upon the seats 3 of the re cesses 2 in which they are positioned, and they are held against accidental displacement by the chord 11. The posts 9 can be withdrawn from the recesses 2 by exerting M an upward pull on the free end of the chord section 11?, and this may be done by means of a cable 16 secured to an eye 17 carried by the hook 15. The top chord 7 rests upon the upper ends of the posts 9 which incline downwardly and outwardly and have their lower ends located outwardly beyond the beveled ends 8 of the top chord 7.

The chords 7 of the trusses 6 are provided with eyebolts 18 with which the upper hooked ends 19 of hanger rods 20 are removably engaged. The lower ends of the hanger rods 20 are provided with closed eyes 21 with which are engaged eyebolts 22 carried by beams 23 which support scaffold boards 24. I

In practice four of the trusses 6 are employed, the lower two of which are used to support the scaflold boards 24 and the upper two of which are held in reserve to support the scaffold boards 24 when it is desired to raise them as a section of the lining 5 is completed. As the hanger rods. 20 are detachably engaged with the eyebolts 18 they may be detached from the two lower trusses 6 and connected to the two upper trusses 6 when it is desired to raise the scaffold boards 24. After this has been done the'lower trusses 6 are raised to a position above the trusses from which the scaffold boards 24 are suspended. To permit the posts 9 to be readily inserted in or withdrawn from the recesses 2 their lateral sides are beveled as indicated at 9 From the foregoing description taken in connection with the accompanying drawings, it will be understood that the scaffold is sim ple and durable and that it may be easily and quickly raised from one position to the other within the chimney or elevator shaft. It will also be understood that the scaffold cannot fall due to the fact that the posts 00- cupy downwardly and outwardly inclined positions with respect to the top chords 7,v that the posts occupy recesses having reinforced seats or tests, and thairt-h'e posts are held against casual inward movement by the chords 11.

While I have described the principle of operation of the invention, together with the device which I now consider to be the best embodiment thereof, I desire to have it understood that the device shown is merely illustrative, and that such changes may be made when desired. as are within the scope of the invention as claimed.

hat is claimed is:

A scaffold comprising supports, posts upon the upper ends of which the supports rest, said posts being downwardly and outwardly inclined, means pivoting the upper ends of the posts to' the supports to permit the posts to be swung inwardly, eyebolts carried by the supports, beams provided with eyebolts, boards carried by the beams, and hanger rods connected to the eyebolts of the beams and provided with hooks detachably engaging the eyebolts of the supports.

In testimony whereof I afiix my signature.

HARVEY J. YAGER. 

